Force-adjustable percussor for neurology department

Abstract

The utility model provides a strength-adjustable percussor for neurology department, which belongs to the technical field of percussor, and comprises a shell mechanism, a power output mechanism is arranged on the shell mechanism, the power output mechanism is connected with a reciprocating mechanism, a strength adjusting mechanism is arranged on the right side of the reciprocating mechanism, and the strength adjusting mechanism is arranged on the right side of the reciprocating mechanism. The power output mechanism comprises a motor box, a motor is arranged in the motor box, a connecting rod is fixed to the output end of the motor, a rotating rod is fixed to the lower end of the connecting rod, two shifting rods are fixed to the rotating rod, and the reciprocating mechanism comprises a movable inserting shaft. The automation degree of the percussion action is high, the working intensity of medical staff is reduced, continuous percussion can be carried out, only the distance between the percussion hammer and the percussion part of a patient needs to be controlled, the percussion hammer can be conveniently used by the medical staff without percussion experience, and high practicability is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of percussion instruments, and in particular relates to a percussion instrument with adjustable strength for neurology. Background Art

[0002] The Department of Neurology mainly diagnoses and treats cerebrovascular diseases (cerebral infarction, cerebral hemorrhage), migraine, inflammatory diseases of the brain (encephalitis, meningitis), myelitis, epilepsy, dementia, neurodegenerative diseases, metabolic diseases and genetic diseases, trigeminal neuralgia, sciatica, peripheral neuropathy (numbness and weakness of the limbs) and myasthenia gravis. The main examination methods include head and neck MRI, CT, ECT, PETCT, electroencephalogram, TCD (transcranial Doppler ultrasound) electromyography, evoked potential and hemorheology examination, etc. At the same time, we cooperate with the Department of Psychology to diagnose and treat functional diseases such as neurasthenia and insomnia.

[0003] Neurology patients generally have problems such as insensitivity, slurred speech or delayed reaction, and doctors need to use corresponding instruments to judge the degree of nerve damage in patients. Currently, the most commonly used instrument for judging the degree of nerve damage in patients is a percussion device. However, the existing percussion device is similar to an ordinary hammer, and the force of percussion depends entirely on the doctor's personal consciousness and feeling. The percussion force cannot be accurately controlled, resulting in human errors in the diagnosis structure. In addition, the control of the percussion position of the existing percussion device during use depends entirely on the doctor's experience level. When the percussion position is not ideal, the error of the diagnosis result will be further increased. Therefore, a percussion device with adjustable force for neurology is designed. Utility Model Content

[0004] The utility model aims to provide a percussion instrument with adjustable strength for neurology, aiming to solve the problems that the percussion instrument in the prior art is similar to an ordinary hammer, the strength of the percussion depends entirely on the doctor's personal consciousness and feeling, and the percussion strength cannot be accurately controlled, resulting in human errors in the diagnosis structure, and the control of the percussion position of the existing percussion instrument during use depends entirely on the doctor's experience level, and when the percussion position is not ideal, the error of the diagnosis result will be further increased.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A percussion device with adjustable force for neurology includes a shell mechanism, a power output mechanism is provided on the shell mechanism, the power output mechanism is connected to a reciprocating mechanism, a force adjustment mechanism is provided on the right side of the reciprocating mechanism, the power output mechanism includes a motor box, a motor is provided in the motor box, a connecting rod is fixed to the output end of the motor, a rotating rod is fixed to the lower end of the connecting rod, two shifting rods are fixed to the rotating rod, the reciprocating mechanism includes a movable plug shaft, an inner sleeve is sleeved on the surface of the movable plug shaft, limiting grooves are provided on the upper and lower sides of the inner sleeve, rocker rods are fixed to the upper and lower side walls of the movable plug shaft, and the two shifting rods are matched with the two rocker rods respectively, a percussion contact is fixed to the left end of the movable plug shaft, a fixed disk is fixed to the right end of the movable plug shaft, and a spring is fixed to the right side of the fixed disk.

[0007] Preferably, the shell mechanism includes an outer sleeve, the outer sleeve is fixed to the left side wall of the inner sleeve, the left side wall of the outer sleeve is provided with a socket, and the percussion contact is movably inserted into the socket, and the rotating rod is rotatably connected to the inner wall of the outer sleeve.

[0008] Preferably, the force adjustment mechanism includes a connecting disk, which is fixed to the other end of the spring, and the right side wall of the connecting disk is rotatably connected to a screw rod through a bearing, and a screw disk is fixed to the right end of the screw rod.

[0009] Preferably, a threaded sleeve is provided on the right side wall of the outer sleeve, and the screw is threadedly connected in the threaded sleeve, and the screw disk is provided on the outside of the outer sleeve.

[0010] Preferably, the surfaces of the two shifting rods and the swing rod are polished smoothly, and the two swing rods are respectively located in the two limiting grooves.

[0011] Preferably, a handle is fixed to the top of the outer sleeve, a motor control button is provided on the handle, and the motor control button is electrically connected to the motor in the motor box.

[0012] Preferably, the surface of the handle is covered with an anti-slip cover, and the surface of the anti-slip cover is provided with anti-slip protrusions.

[0013] Preferably, the surface of the screw disk is provided with a plurality of equally spaced anti-slip grooves, and the length of the screw rod matches the length of the two limiting grooves.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. In this scheme, the whole percussion device has a reasonable structure, ingenious design, and flexible use. The percussion force during percussion can be adjusted according to different usage requirements, and the percussion action has a high degree of automation, which reduces the work intensity of medical staff and can perform continuous percussion. It only needs to control the distance between the percussion device and the percussion part of the patient, which is convenient for medical staff without percussion experience to use. It has strong practicality and can effectively solve the problem that the percussion device in the prior art is similar to an ordinary hammer, and the percussion force depends entirely on the doctor's personal consciousness and feeling, and the percussion force cannot be accurately controlled, resulting in human errors in the diagnosis structure. In addition, the control of the percussion position of the existing percussion device during use depends entirely on the doctor's experience level. When the percussion position is not ideal, the error of the diagnosis result will be further increased. When the utility model is used, the percussion contact in the reciprocating mechanism is first aligned with the patient's The percussion contact in the entire reciprocating mechanism is driven to percuss the patient's percussion part through the power output mechanism. The motor in the motor box in the power output mechanism drives the rotation of the connecting rod, so that the connecting rod drives the rotation of the two levers on the entire rotating rod. The rotation of the two levers will drive the two swing rods and the fixed movable plug shaft to slide to the right in the inner sleeve, so as to achieve force storage. After the entire movable plug shaft and the percussion contact slide to the right to a certain distance, due to the limited length of the two levers, the restriction on the two swing rods will be lost after continuous rotation, so that the entire movable plug shaft will pop out to the left in the inner sleeve through the elastic force of the spring fixed on the right, and drive the percussion contact to percuss the patient's percussion part, and the percussion part of the patient is percussed in this cycle. The percussion force of the patient can be adjusted according to different usage requirements through the force adjustment mechanism. At the same time, it is convenient to operate and carry.

[0016] 2. In this solution, the outer shell mechanism can support the power output mechanism and the reciprocating mechanism through the entire outer sleeve, and set the internal parts of the entire device to improve the service life of the device. The percussion contact can reciprocate through the jack on the outer sleeve to perform cyclic percussion on the patient's percussion part. The force adjustment mechanism can drive the entire screw to rotate through the inner thread of the threaded sleeve on the outer sleeve by turning the screw disk, so as to change the distance between the connecting disk connected to the screw and the fixed disk connected to the movable plug shaft, thereby changing the compression degree of the spring to adjust the percussion force of the entire percussion contact. The closer the distance between the connecting disk and the fixed disk, the greater the percussion force, and vice versa. The screw is connected to the inner thread of the threaded sleeve, and the self-locking property of the thread is used to prevent the entire screw from moving easily. At the same time, the screw disk is set on the outside of the outer sleeve, which improves the convenience of adjusting the force adjustment mechanism. The surfaces of the swing rods are all smoothly polished to avoid jamming of the two swing rods during their rotation, and placing the two swing rods in two limit grooves respectively can effectively limit the positions of the two swing rods to prevent the entire movable plug shaft and the percussion contact from being separated from the inner sleeve. The handle on the top of the outer sleeve can provide a fulcrum for carrying or operating the entire device. The motor control button on the handle can control the motor in the motor box, thereby improving the convenience of using the percussion device. The surface of the handle is provided with an anti-slip sleeve with anti-slip protrusions, which can not only improve the anti-slip effect of holding the handle, but also improve the comfort of using the device. A plurality of equidistantly distributed anti-slip grooves are provided on the surface of the dial to increase the friction between the hand and the dial when the strength adjustment mechanism manually turns the dial, making the adjustment easier. Matching the length of the screw with the length of the two limit grooves can enable the reciprocating mechanism to cooperate with the strength adjustment mechanism to avoid over-adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 For this utility model Figure 1 Exploded view in ;

[0020] Figure 3 It is a three-dimensional diagram of the utility model;

[0021] Figure 4 For this utility model Figure 3 Exploded view in ;

[0022] Figure 5 It is a left view of the utility model;

[0023] Figure 6 For this utility model Figure 5 Cross-sectional view at AA in the middle.

[0024] In the figure: 1. outer sleeve; 101. threaded sleeve; 102. socket; 103. handle; 2. motor box; 201. motor control button; 202. connecting rod; 203. rotating rod; 204. lever; 3. movable plug shaft; 301. rocker rod; 302. percussion contact; 303. limiting groove; 304. inner sleeve; 305. fixing disk; 306. spring; 4. connecting disk; 401. bearing; 402. screw rod; 403. screw disk. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example 1

[0027] See also Figure 1 - Figure 6 The utility model provides the following technical solutions: a percussion instrument with adjustable strength for neurology includes a shell mechanism, a power output mechanism is arranged on the shell mechanism, the power output mechanism is connected with a reciprocating mechanism, a strength adjustment mechanism is arranged on the right side of the reciprocating mechanism, the power output mechanism includes a motor box 2, a motor is arranged in the motor box 2, a connecting rod 202 is fixed to the output end of the motor, a rotating rod 203 is fixed to the lower end of the connecting rod 202, two levers 204 are fixed to the rotating rod 203, the reciprocating mechanism includes a movable plug shaft 3, an inner sleeve 304 is sleeved on the surface of the movable plug shaft 3, limiting grooves 303 are provided on the upper and lower sides of the inner sleeve 304, swing rods 301 are fixed to the upper and lower side walls of the movable plug shaft 3, and the two levers 204 are matched with the two swing rods 301 respectively, a percussion contact 302 is fixed to the left end of the movable plug shaft 3, a fixed disk 305 is fixed to the right end of the movable plug shaft 3, and a spring 306 is fixed to the right side of the fixed disk 305.

[0028] In the specific embodiment of the utility model, the whole percussion device has a reasonable structure, ingenious design, and flexible use. The percussion force during percussion can be adjusted according to different usage requirements, and the percussion action has a high degree of automation, which reduces the work intensity of medical staff and can perform continuous percussion. It only needs to control the distance between the percussion device and the percussion part of the patient, which is convenient for medical staff with no percussion experience to use. It has strong practicality and can effectively solve the problem that the percussion device in the prior art is similar to an ordinary hammer, and the percussion force depends entirely on the doctor's personal consciousness and feeling, and the percussion force cannot be accurately controlled, resulting in human errors in the diagnosis structure. In addition, the control of the percussion position of the existing percussion device during use depends entirely on the doctor's experience level. When the percussion position is not ideal, the error of the diagnosis result will be further increased. When the utility model is used, the percussion contact 302 in the reciprocating mechanism is firstly aimed at the percussion part of the patient, and then the power output mechanism drives the whole device to move. The percussion contact 302 in the reciprocating mechanism taps the patient's percussion part, and the motor in the motor box 2 in the power output mechanism drives the connecting rod 202 to rotate, so that the connecting rod 202 drives the two levers 204 on the entire rotating rod 203 to rotate. The rotation of the two levers 204 will drive the two rocking rods 301 and the fixed movable plug shaft 3 to slide to the right in the inner sleeve 304, so as to accumulate force. After the entire movable plug shaft 3 and the percussion contact 302 slide to the right to a certain distance, due to the limited length of the two levers 204, the restriction on the two rocking rods 301 will be lost after continuous rotation, so that the entire movable plug shaft 3 will pop out to the left in the inner sleeve 304 through the elastic force of the spring 306 fixed on the right side, and drive the percussion contact 302 to tap the patient's percussion part, and perform percussion on the patient's percussion part in this cycle. The percussion part of the patient is percussed, and the device can adjust the percussion force according to different usage requirements through the force adjustment mechanism. At the same time, it is convenient to operate and carry.

[0029] Specifically, the shell mechanism includes an outer sleeve 1, which is fixed to the left side wall of the inner sleeve 304. The left side wall of the outer sleeve 1 is provided with a socket 102, and the percussion contact 302 is movably inserted into the socket 102. The rotating rod 203 is rotatably connected to the inner wall of the outer sleeve 1.

[0030] In this embodiment: the outer shell mechanism can support the power output mechanism and the reciprocating mechanism through the entire outer sleeve 1, and can house the internal components of the entire device to increase the service life of the device. The percussion contact 302 can reciprocate through the socket 102 on the outer sleeve 1 to cyclically tap the percussion part of the patient.

[0031] Specifically, the force adjustment mechanism includes a connecting disk 4, which is fixed to the other end of the spring 306. The right side wall of the connecting disk 4 is rotatably connected to a screw rod 402 through a bearing 401, and a screwing disk 403 is fixed to the right end of the screw rod 402.

[0032] In this embodiment: the force adjustment mechanism can drive the entire screw 402 to rotate the internal thread of the threaded sleeve 101 on the outer sleeve 1 by rotating the screw disk 403, so as to change the distance between the connecting disk 4 connected to the screw 402 and the fixed disk 305 connected to the movable plug shaft 3, thereby changing the compression degree of the spring 306, and adjusting the knocking force of the entire percussion contact 302. The closer the distance between the connecting disk 4 and the fixed disk 305 is, the greater the knocking force is, and vice versa.

[0033] Specifically, a threaded sleeve 101 is provided on the right side wall of the outer sleeve 1 , and the screw rod 402 is threadedly connected in the threaded sleeve 101 , and the screw disk 403 is provided on the outside of the outer sleeve 1 .

[0034] In this embodiment: the screw rod 402 is threadedly connected to the threaded sleeve 101, and the self-locking property of the thread is utilized to prevent the entire screw rod 402 from moving easily. At the same time, the screw disk 403 is arranged on the outside of the outer sleeve 1, which improves the convenience of adjusting the force adjustment mechanism.

[0035] Specifically, the surfaces of the two levers 204 and the swing rod 301 are polished and smooth, and the two swing rods 301 are located in the two limiting grooves 303 respectively.

[0036] In this embodiment: the surfaces of the two levers 204 and the rocker arm 301 are polished to be smooth, which can avoid jamming of the two rocker arms 301 during the rotation of the two levers 204, and the two rocker arms 301 are respectively located in two limit grooves 303 to effectively limit the positions of the two rocker arms 301, preventing the entire movable plug shaft 3 and the percussion contact 302 from being separated from the inner sleeve 304.

[0037] Specifically, a handle 103 is fixed on the top of the outer sleeve 1 , a motor control button 201 is provided on the handle 103 , and the motor control button 201 is electrically connected to the motor in the motor box 2 .

[0038] In this embodiment, the handle 103 on the top of the outer sleeve 1 can provide a fulcrum for carrying or operating the entire device, and the motor control button 201 on the handle 103 can control the motor in the motor box 2, thereby improving the convenience of using the percussion device.

[0039] Specifically, the surface of the handle 103 is covered with an anti-slip cover, and the surface of the anti-slip cover is provided with anti-slip protrusions.

[0040] In this embodiment, an anti-skid cover with anti-skid protrusions is provided on the surface of the handle 103, which not only improves the anti-skid effect of holding the handle 103, but also improves the comfort of using the device.

[0041] Specifically, a plurality of equally spaced anti-slip grooves are formed on the surface of the screw disk 403 , and the length of the screw rod 402 matches the length of the two limiting grooves 303 .

[0042] In this embodiment: a plurality of equidistantly distributed anti-slip grooves are provided on the surface of the dial 403 to increase the friction between the hand and the dial 403 when the force adjustment mechanism manually turns the dial 403, making adjustment easier. Matching the length of the screw 402 with the length of the two limit grooves 303 can enable the reciprocating mechanism to cooperate with the force adjustment mechanism to avoid over-adjustment.

[0043] The working principle and use process of the utility model: when the utility model is in use, the percussion contact 302 in the reciprocating mechanism is firstly aimed at the percussion part of the patient, and then the percussion contact 302 in the entire reciprocating mechanism is driven to percuss the patient's percussion part through the power output mechanism, and the motor in the motor box 2 in the power output mechanism drives the rotation of the connecting rod 202, so that the connecting rod 202 drives the rotation of the two levers 204 on the entire rotating rod 203, and the rotation of the two levers 204 will drive the two swing rods 301 and the fixed movable plug shaft 3 to slide to the right in the inner sleeve 304, so as to achieve power storage, and after the entire movable plug shaft 3 and the percussion contact 302 slide to the right to a certain distance, due to the limited length of the two levers 204, they continue to rotate. After that, the restriction on the two rocker arms 301 will be lost, so that the entire movable plug shaft 3 will pop out to the left in the inner sleeve 304 through the elastic force of the spring 306 fixed on the right side, and drive the percussion contact 302 to percuss the patient's percussion part, and in this way, the percussion part of the patient is percussed in a cycle, and the percussion percussion part of the patient is percussed. The device can adjust the percussion percussion force according to different usage requirements through the force adjustment mechanism. At the same time, it is convenient to operate and carry. The shell mechanism can support the power output mechanism and the reciprocating mechanism through the entire outer sleeve 1, and set the internal parts of the entire device to improve the service life of the device. The percussion contact 302 can reciprocate through the jack 102 on the outer sleeve 1 to cyclically percuss the patient's percussion part. The mechanism can drive the entire screw rod 402 to rotate on the inner thread of the threaded sleeve 101 on the outer sleeve 1 by rotating the screw disk 403, thereby changing the distance between the connecting disk 4 connected to the screw rod 402 and the fixed disk 305 connected to the movable plug shaft 3, thereby changing the compression degree of the spring 306, and adjusting the knocking force of the entire percussion contact 302. The closer the distance between the connecting disk 4 and the fixed disk 305 is, the greater the knocking force is, and vice versa. The screw rod 402 is connected to the inner thread of the threaded sleeve 101, and the self-locking property of the thread is utilized to prevent the entire screw rod 402 from moving easily. At the same time, the screw disk 403 is arranged on the outside of the outer sleeve 1, which improves the convenience of adjusting the force adjustment mechanism. The two levers 204 and the swing rod 3 are connected. The surfaces of the two levers 204 are all polished and smooth, which can avoid the jamming of the two swing rods 301 during the rotation of the two levers 204, and the two swing rods 301 are respectively located in the two limit grooves 303, which can effectively limit the positions of the two swing rods 301, and prevent the entire movable plug shaft 3 and the percussion contact 302 from being separated from the inner sleeve 304. The setting of the handle 103 on the top of the outer sleeve 1 can provide a fulcrum for carrying or operating the entire device. The motor control button 201 on the handle 103 can control the motor in the motor box 2, which improves the convenience of using the percussion device. The surface of the handle 103 is provided with an anti-slip cover with anti-slip protrusions, which can not only improve the anti-slip effect of holding the handle 103, but also improve the comfort of using the device.A plurality of equally spaced anti-skid patterns are provided on the surface of the screw disk 403, which can increase the friction between the hand and the screw disk 403 when the strength adjustment mechanism manually rotates the screw disk 403, making the adjustment easier. Matching the length of the screw rod 402 with the length of the two limit slots 303 can prevent the reciprocating mechanism from cooperating with the strength adjustment mechanism to avoid over-adjustment. The entire percussion device has a reasonable structure, ingenious design, and flexible use. The percussion force during percussion can be adjusted according to different usage requirements, and the percussion action has a high degree of automation, which reduces the work intensity of medical staff. Continuous percussion can be performed, and only the distance between the percussion device and the percussion part of the patient needs to be controlled. It is convenient for medical staff without percussion experience to use, has strong practicality, and can effectively solve the problem that the percussion device in the prior art is similar to an ordinary hammer, and the percussion force depends entirely on the doctor's personal consciousness and feeling. The percussion force cannot be accurately controlled, resulting in human errors in the diagnosis structure. In addition, the control of the percussion position of the existing percussion device during use depends entirely on the doctor's experience level. When the percussion position is not ideal, the error of the diagnosis result will be further increased.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A percussion instrument with adjustable force for neurology, characterized in that: The invention comprises a shell mechanism, on which a power output mechanism is arranged, the power output mechanism is connected to a reciprocating mechanism, a force adjustment mechanism is arranged on the right side of the reciprocating mechanism, the power output mechanism comprises a motor box (2), a motor is arranged in the motor box (2), a connecting rod (202) is fixed at the output end of the motor, a rotating rod (203) is fixed at the lower end of the connecting rod (202), two shifting rods (204) are fixed on the rotating rod (203), the reciprocating mechanism comprises a movable plug shaft (3), the An inner sleeve (304) is sleeved on the surface of the movable plug shaft (3), and limit grooves (303) are provided on both upper and lower sides of the inner sleeve (304). Rocker rods (301) are fixed to the upper and lower side walls of the movable plug shaft (3), and two levers (204) are matched with the two rocker rods (301) respectively. A percussion contact (302) is fixed to the left end of the movable plug shaft (3), and a fixed disk (305) is fixed to the right end of the movable plug shaft (3), and a spring (306) is fixed to the right side of the fixed disk (305).

2. The neurology percussion device with adjustable force according to claim 1, characterized in that: The shell mechanism comprises an outer sleeve (1), the outer sleeve (1) being fixed to the left side wall of the inner sleeve (304), the left side wall of the outer sleeve (1) being provided with a plug hole (102), and the percussion contact (302) being movably plugged into the plug hole (102), and the rotating rod (203) being rotatably connected to the inner wall of the outer sleeve (1).

3. The percussion instrument with adjustable force for neurology according to claim 2, characterized in that: The force adjustment mechanism comprises a connecting disk (4), wherein the connecting disk (4) is fixed to the other end of the spring (306), the right side wall of the connecting disk (4) is rotatably connected to a screw rod (402) via a bearing (401), and a screwing disk (403) is fixed to the right end of the screw rod (402).

4. The neurological percussion device with adjustable force according to claim 3, characterized in that: A threaded sleeve (101) is provided on the right side wall of the outer sleeve (1), and the screw rod (402) is threadedly connected in the threaded sleeve (101), and the screw disk (403) is provided on the outside of the outer sleeve (1).

5. The neurological percussion device with adjustable force according to claim 1, characterized in that: The surfaces of the two shifting rods (204) and the swing rod (301) are both polished and smooth, and the two swing rods (301) are respectively located in the two limiting grooves (303).

6. The neurology percussion device with adjustable force according to claim 2, characterized in that: A handle (103) is fixed on the top of the outer sleeve (1), a motor control button (201) is provided on the handle (103), and the motor control button (201) is electrically connected to the motor in the motor box (2).

7. The neurological percussion device with adjustable force according to claim 6, characterized in that: The surface of the handle (103) is covered with an anti-slip cover, and the surface of the anti-slip cover is provided with anti-slip protrusions.

8. The neurology percussion device with adjustable force according to claim 3, characterized in that: The surface of the screw disk (403) is provided with a plurality of equally spaced anti-slip grooves, and the length of the screw rod (402) matches the length of the two limiting grooves (303).

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